C# 获取AD（域用户）的有关问题

C# 获取AD（域用户）的问题
在C#代码里有这么一段代码

C# code

DirectoryEntry entry = new DirectoryEntry(path);DirectorySearcher searcher = new DirectorySearcher(entry);searcher.Filter = "(objectClass=*)";searcher.PropertiesToLoad.Clear();SearchResultCollection searchResultCollection = searcher.FindAll();foreach (SearchResult result in resultCollection)            {if ([color=#FF0000]result.Properties.Contains("samaccountname"))[/color]                {                    ResultPropertyValueCollection resultValue = result.Properties["samaccountname"];                    if (resultValue != null && resultValue.Count > 0 && resultValue[0] != null)                    {                        userName = resultValue[0].ToString();                    }                }}

请问红色那部分表示的是什么意思，获取的是什么的属性？AD里的属性么？

[解决办法]
result.Properties的类型是ResultPropertyCollection 
ResultPropertyCollection.Contains：
Determines whether the property that has the specified name belongs to this collection.
[解决办法]
就是判断result.Properties中是否有名字为samaccountname的propery
[解决办法]
http://msdn.microsoft.com/en-us/library/windows/desktop/ms679635(v=vs.85).aspx

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